Kiln dried Ash & oak firewood logs our bestseller for premium, longer and hotter burning firewood made up from best species in the market – ash & oak firewood Flexi size crate. One of our best selling firewood crates. Ash and oak logs are EU standard size, 25cm in length and 7-15cm wide measured across the widest edge. sh & Oak is neatly hand packed in Flexi size crate. Ash & Oak firewood meets highest standards, average 8-16 % MC, Woodsure / Hetas accredited.